Hydraulic hoisting device.



G. A. WOOD.

HYDRAULIC HOISTING DEVICE.

APPLIcATloN FILED JUNE 6.1917.

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G: A. WOOD.

HYDRAULIC HOISTING DEVICE.

APPLICATION FILED JUNE a, |917,

Patented July 9, 1918.

2 SHEETS-SHEET 2.

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HYDRAtrLrc-.Iiors'rmGDEVICE- ii To all whom it may concern:

Be it known that I, GARFIELD A. WOOD, a

` citizen of the United States, and residing at It consists in a split clamping member e`X- tending around the cylinder at an interme- Specication of Letters Patent.

1917. serialNo. 1733051.' l

clamping element that includes a front half 12 vand the connecting bolts 13 and conforms i to a circumferential groove cut in. the outer surface ofthe cylinder.

The upper end of the cylinder receives a llijollow. head 16 which may Yhave circumferential flanges 181and 19 conforming to the inner surface of the cylindei1 and may be machined out circumferentially to receive 'suitable-packing 2O which, when the head is vdrawn downwardly as hereinafter described, v

allows a metal-to-metal contact between the head and theend surface of the cylinder and seals the joint. A hollow piston rod 2 2, having a piston 23, slides up and down through 'the head and through a packing plate 24 that has an annular ldepending iange Patented July 9, 11.918, Original application led January 15, 1917, Serial No. 142,406. l `Divided and this application filed June 6,

diate point in the length thereof; in an imv proved head construction 'for the cylinder;

in means -connecting said clamping member arranged to project into,and compress pack- 70 ing 2 6 in the upper inner portion of the head f 20 and said head construction for retaining the p 16 .t0 DSIIIG a tight jint betWeIl the' latter-H 'sjvehicle/fseat. FigfB'is a fragmentaryv front Y oted to swing vertically about horizontal '45 able cross frame preferably forfgned'of-'anglea'nd suitable-.lock washers or the and the 4piston-rod. `.The-,packing plate is latter in place; in means whereby the cylindrawn down upon the head by' means of the.;

der and hollow piston rod which constitute the oil reservoir may be -lled to a high level nuts ,27 on. the .bolts 28y and 29,- spaced `dia.l 7 5.

metrically from each. other, the formera-besingthrea'dedv into a boss 30 on the member '11' and the, latter .into a boss '31 on an upward extension of the member 12.

Extending crosswisethrough theprojecting end of the piston rod is a pivotbolt 33 upon whch-is'supported an equalizing cross# bar 34 having-.pulleys 35 suspended from its outer ends. Cables 36, secured tothe lower` ends of the depending body body 2, pass over the corresponding pulley fandy have their inner ends bentaround--the corresponding'clamping vbolt 13 andsecured in place by. suitable shackles 39.

Depending from the front cross-bar 6 is Q0 an' a .ng l'e"- :iron 40 ,uppn one side of which is rinoun'ted a gear puiaspil -(preferably that pivots located near the rearend thereof,"3 shown and' claimed in iiiyrnapplication 'forl therivers seat, 4 the upright hoisting cylf patent Serial Number ,14479,-f1led March 15,l inder, the base 5 of which is supported'from 1915) that is' driven from a longitudinally95 thesidebars through the medium .of 'a suite extending .shaft 42 of t-hel vehicle in any.; i suitable manner, .for example, by ythe vi lons 6 to which the .base is bolted.' The upl sprocket gears-4 3 ,and (thelatterbeingk per end of the cylinder is braced from tliejmounted on theopposite side of the memberl youter ends of thefront angle-iron Gbymeaiis '5.40) ,the chainv 4 5, the clutch pins 46 'and the. f *of tension rods A8' (jhaving. nut`s'9 v0n each end clutch member 48 carried byA thefpropeller equivalent. `shaft 42 off-1th,@l vehicle.: rThe clutch lpins 46 preferably are slidabl'e'longitudinally 'through `t e gear of a 44 through the mediumi of yoke arms50 rand through a single port; and in various other 25=`details of construction shown,-described and claimed.

This application is `a :division of my former application Serial No. 142,406, l'ed J anuary 15,` 1917 M 39 ,lr'the drawings, Figure 1 is a fragmentaryside elevation, parts/being broken away, ,v showing one emgbodiment of the invention. Fig. 2 is .a l'view cpgrresponding'theretolooking backwardly f In aplane justbehin'd' the view of the hoisting Acylinder and support. Fig..4i s a section on the line 4-4of Fig.'3.

KYFig. 5 is a section ,on the line 5- -5 of Fig. 4.l

, l'lindicates the' side bars, 2 the bodypiv-y arms 38 ,ofl the 85 the actuating arm 51 rigid with the shaft 52 which is mounted in the lower ends of member 40 and a vcompanion, member 53. The specific construction described in this paragraph is claimed in my application for patent Serial Number 135,797, filed December 8th, 1916, and may be varied widely. In

some instances the pump may be driven by a countershaft :as shown in my application for patent Serial Number 142,405, filed J anuaryv 15th, 1917.

In the present instance, however, the link the valve arm 62 of the pump. f. l

In order to allow the use of the interior of thecylinder above the piston as a reser-v voir for oil, the cylinder is provided with a port 64 in the groove 15 opposite the member 1 2, andv the latter Iis provided with a passage 65 withwhich the suction pipe.66 which leads to the pump is connected by a packing gland 68.l A sealing washer 69 is interposed between lthe member 12 and the cylinder. From the pump the oil is delivered through the pipe 70 and passage 71 (F ig. 4) to the space beneath the piston.

f The interior of the piston rod is also usedas a part of the reservoir, holes 72 (preferably cored out in the piston v23, thus avoiding an drilling of the piston rod 22) (Fig. 4),being provided to allow ingress and egress ofthe liquid. At its upper end the piston rod is preferably closed by the diaphragm 73'and is perforated at 74 to admit air when the piston rod has risen a short distance whereby a tight seal is secured and the partial vacuum which would otherwise obtain in the rod is broken in the general manner shown and claimed in my application rfor patent Serial Number 14480,.liled March 15,1915. The upper end of the piston rod might in some cases be left open as the cross-bar 34 would exclude foreign objects, but the tendency for the oil to slop'over as the piston sinks would be objectionable.

Considering those features of cylinder and piston rod construction thus far described, it will be seen that it-would not bei possibleto lill that portion of the cylinder abov'ethe single portv 64 by pouring liquid through said port. It would also be objectionable to pierce the cylinder. at a higher level, and the head 16 and packing plate 24 could not well be pierced to allow the escape of the trapped air. In order to avoid these objections and at the same time provide a cheaper construction, the piston rod is piercediat a point located abovel the upper distance from thev port 64 to the lower surface of the head 16 as indicated at 76. The

cylinder and piston rod being illedin an obvious manner to the level of the upper edge of the port, it is then only necessary to work the pump to elevate the piston until it reaches the lower edge o f the port 64, remove the plug 78 for an upward extension 79 'of the passage 65 in the member A12 and pour in additional oil to cover the port to a depth sufficient to prevent air from being drawn into the suction pipe 66, in which operation the air will escape through the passage 76 (which would then be just below the head 16), the interior off the piston rod, and the passage 74 and allow the oil to 'rise as high asthe entrance to the passage 79 if desired.

From the foregoing it will be understood that liquid may be either drawn from the reservoir through the suction pipe 66 and discharged through the pipev for lifting purposes, or may be by-passed from the pipe 0 to the pipe 66 for lowering, or may be circulated continuously within the pump casing, as described in my application Serial Numberh14479, referred to above. It will alsobe seen that the upward movement of the piston Lrod is automatically limited when the piston uncovers the port 64.

The -details of construction may be varied within wide limits without departing from the spirit of the invention, and I do not,

therefore,'wish to be limited except as in-v dicated by the subjoined claims.

1. An upright hoisting cylinder, clamping means encircling the upper portion of said cylinder in a groove, a piston and piston rod slidable in said cylinder, an annular head for said cylinder, and bolts associated with y the clampmg means whereby said head is retained in' position.

2. An upright hoisting cylinder, clamping means encircling the upper portion of said cylinder in a groove, a piston and piston f rod slidable in said'cylinder, an annular head for said cylinder, the inner face of said head being grooved to receive packing for sealing the joint between it and the piston rod, a packing plate arranged to engage tending from said port to a higher level,I

said piston rod rbeing perforated at a point and compress said packing, and bolts assoconsiderably vabove the piston yvvlnereby'.vvheri air above the port and between the pistonrod and the' cylinder may. escape through connected to the piston' liquidis introduced through-the passage, the

the piston rod.

4. An uprighthoisting cylinder, a hollow l piston and vpiston rod slidable therein, a head for the cylinder,'a `por-'t rod being in communication of the piston 'between thepiston rod and with the space the cylinder, a passage externally cylinder extending from said ort to a higher level, said piston rod being yperfo'-A rated at a point located above the piston a distance less than the distance from the port to thehead whereby, whe'nliquidV is introduced through the passage, t

e air above the port and between thel pl'sto rod Vand the .cylindermay escape through the piston rod. 5. An upright cylinder, an annular lhead for theupper end of the'cylinder, a piston slidable in the cylinder,a hollowpiston rod and projecting through thefhead in sealed relation thereto,

" the piston', rod, when 'in lowered position, be-

one just ing in connnunication with the s ace between -it and thecylinder below theQhead, a second near the lower end of therod, and the third some dis-'- tance above .the second, the cylinder:havi1 1g,

a port located below the lower surface of Vthe head-a distance atleast equal to the dif-v ference in level between the second and third points of communication between the interior of the piston. rod and the space betweep 6. An upright hoisting "cylinder having a near its upper end and beingH the rod and the cylinder.

groove therein perforated at the groove,i'a piston. and piston rod reci vided clamping element extendin around the cylinder and having a ortion tereof reeived in the groove an aroundthe perforation therein, whereby when theparts of the element are drawntogether byy afmovement transversely of the cylinder 'a close joint is secured-betweenfthe element and the callse the latterl toV rise. 1'

7.'.An1lupri'ght cylinder, a head'. for the adjacent surface of the groove, the clamping' element having va passage in registration with the erforation in the withdrawing sage'andy expelling 1t below thejpiston` to 'Ripper end ef the cylinder, Hema-slidable proj ectingthrou'gh the head, means fonsealfing the joint lthe head, automat1c means for limitihgiithd in the. cylinder,

a piston r connected to the piston, the piston rod being hollow and between the piston rod. and

upward stroke of the piston,` the interiorl of -the piston'rod being in r corriinunicationfwith in the cylinder some distance below the head, the lower endv of the lport through wardly extending passage at three di erent levels-,

procable in the cylinder, a ditension port, a short bolt groove, 'the yspace between t e cylinder and piston rod serving. i asl a reservoir for liquid, andlfmeans rfor the liquid throughl ,th pasthe annular4 space surrunding the rod 'at two different levels spaced considerabl apart near the lower end of the piston lro both of, said levels being below the head when the piston 4rod is at the upper limit of its movement.

' 8. A cylinder having a port in its wallv' near one end,la piston and piston rod slidable in said cylinder, a clamping element,

conforming to the cylinder around the port, means for drawing` the clamping element transversely of -the cylinder into sealed relation therewith, said element having a passage therein` which liquid in Athe cylinder is allowed to escape.

`9. An upright hoisting cylinder having a port in its wall near its upper end, apiston and piston r'od slidable in the cylinder, a divided clamp extending aroundthe cylinder at the port, one of the divisions of they clamp covering the port, means for sealing i the joint between said division andthe port,

therein an upthrough which liquid may be poured into the cylinder said division having formed through the port.

10. An' upright hoisting cylinder having in communlcation with the f li8() a port in itswall near its upper end, a piston and piston rod slidable in the cylinder,

havin an having a passage leading to the' connecting the head. a longer bolt connecting the extension and at a point spaced the head andthe clamp angularly about thev axis of the cylinder v including an anfrom the short bolt.

12. An'upright cylinder, nularuppery head, a piston and'hollow pistonrod reciprocable inzthe"cylinder, said piston rod passing through the upper head andfforming' therewith a sealed joint, the

interior'o the piston -rod being' i'n-communi'cation with the annular` space surrounding the rodat a point -near the lower end of said rod,.a port in the cylinder wall considerably below the`head, means in' seallng relation to the cylinder' around the port and 'extending `up`wardly therefrom for forming an upwardly opening passage which liquid may' be. poured lntol the cylinder, said passage communicatlngwlth the through a clamp passing around the extension at one side and sai ex rae interior ofthe cylinder at the port-only andv termlnating somewhat'below the upper end of thep1ston rod.

13. In combination, an upright cylinder,

a lower end for the cylinder, .a piston and piston rod slidable in the cylinder, a pump for forcing liquid between the piston and said lower end, the space between the cylinder and the rod above the piston constituting a storage chamber for liquid, means for limiting the upward movement of the piston, said means including a port in the wall of the cylindernear the upper end, a suction pipe leading to the pump,` and a divided clamp including a hollow portion conforming to the cylinder and surroundcommunication with the annular space surroundingsaid rod at substantially the lower end thereof, means for forming a passagefopening intothe cylinder near the upper end thereof, said 'passageconnecting with v remove .the lower' end of the cylinder below the also extending considerably piston and above the first mentioned opening into the cylinder, but -terminating below the upper end of the piston rod, a removable plug for ythe upper end of said passage, said passage communicating with the cylinder' only at the two points mentioned. p 15. An uprightcylinder, a' piston 'and hollow piston rod reciprocable therein, said rod projecting from and iIi sealed vrelation to the upper end of the cylinder, a closure for the yupper end ofthe rod, the interior yof the` rod being in` communication with the annular space between it and the cylinder at substantially the lower end of the rod, a

vent for the upper end of the rod'whereby the interior of the rod is in communication with the atmosphere at least throughout the greater portion of the movement of the rod, means for forming a passage opening into the cylinder at substantially two levels only, one being below the piston and the other being ata point near the upper end ofY said cylinder, said passage opening upwardly above the point at which it omrnu nicatesl with the upper portion of the cylinder and having a plugged entrance below' the closure for the upper end of the piston rod.

GARFIELD A. WOOD. 

